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We reserve the right to modify technical specifications without prior notice.
83050700aUK – Translation of the operating manual
© Alpha-InnoTec GmbH
A system log should be kept, in which the relevant plan-
ning & design data is entered (vdI 2035).
damage that Can oCCur in Case of failure to
Comply With the above
- malfunctions and the failure of components (e.g.
pumps, valves)
- Internal and external leaks (e.g. from heat exchangers)
- cross-section reduction and blockaging of compo-
nents (e.g. heat exchanger, pipes, pumps)
- material fatigue
- Gas bubbles and gas cushion formation (cavitation)
- negative effect on heat transfer (formation of coat-
ings, deposits) and associated noises (e.g. boiling
noises, flow noises)
limesCale – the energy killer
Filling with untreated drinking water inevitably leads to
the precipitation of all calcium as scale. The consequence:
limescale deposits form on the heat transfer surfaces of
the heating. The efficiency falls and the energy costs rise.
A rule of thumb is that 1 millimetre of limescale deposit
causes an efficiency loss of 10%. In extreme cases it can
even cause damage to the heat exchangers.
Water softening to vdi 2035 – part i
If the water is softened in accordance with the vdI 2035
guidelines before it is used to fill the heating system, no
scale can form. This effectively and permanently prevents
limescale deposits and the resulting negative effects on
the entire heating system.
Corrosion – an underestimated problem
vdI 2035, part II, deals with the problem of corrosion.
Softening the heating water can prove to be insufficient.
The pH value can significantly exceed the limit of 10. pH
values higher than 11 can set in, which even damage rub-
ber seals. The vdI 2035, part 1 guidelines are fulfilled;
however, vdI 2035, part 2 suggests a pH value between
8.2 and maximum 10.
If aluminium materials are used, which is the case in
many modern heating systems, a pH value of 8.5 must
not be exceeded! because otherwise there is a threat of
corrosion – aluminium is attacked without the presence
of oxygen. Therefore, apart from softening the heating
fill and make-up water, the heating water should also be
Flushing and filling the system
Important
The system must be absolutely free from air
before commissioning.
Water quality
of the fill and make-up Water in Water heat-
ing systems aCCording to vdi 2035 part i and ii
Use of modern, energy-efficient heat pump systems
is becoming increasingly widespread. Their ingenious
technology enables these systems to achieve very good
efficiencies. The decreasing space available for heat gen-
erators has led to the development of compact units
with increasingly smaller cross-sections and high capaci-
ties. This means that the complexity of the systems and
the material diversity are also increasing, which plays
an important role, especially in their corrosion behav-
iour. Alpha InnoTec ensures continuous technological
advances, but all these technical refinements require
the system to be operated with correctly filled heating
water. The heating water not only affects the efficiency
of the system, but also the life of the heat generator and
the heating components of a system.
The guide values of vdI 2035 part I and part II must
therefore be complied with as minimum requirements for
proper operation of the systems. our practical experi-
ence has shown that the safest, most reliable and fault-
free running is achieved with so-called low-salt operation.
vdI 2035 part I provides important information and
recommendations regarding scaling and its prevention in
heating and domestic hot water heating systems.
vdI 2035 part II primarily deals with the requirements
for reducing heating water corrosion in hot water heat-
ing systems.
prinCiples of part i and part ii
The occurrence of scaling and corrosion damage in hot
water heating systems is low, if
- proper planning, design and commissioning is carried
out
- the system is closed in corrosion terms
- adequately dimensioned pressurising is integrated
- the guide values for the heating water are complied
with
- and regular servicing and maintenance are carried out.
